Depending on personal circumstances (including available time & money), abilities to play, and desire to do so, any game is able to be finished in one sitting (if it is able to be "finished" at all).

At this price, if you take more than a week to play through the game you may find buying is a better option & re-selling pre-owned thereafter to recoup some of the expense in doing so.

How long did you read this game took to finish (without the usual reviewer one-up-manship of trying to claim to "finish" a game in the fastest time possible because they think that makes them sound superior to their [now alienated] reading audience)?

Other factors have to be considered; primarily replay value versus initial purchase price.